def main():
    print(['Yes', 'No'][int(input()) < 30])


if __name__ == '__main__':
    main() def main():
    print(['Yes', 'No'][int(input()) < 30]) main print(['Yes', 'No'][int(input()) < 30]) print ['Yes', 'No'][int(input()) < 30] ['Yes', 'No'] 'Yes' 'No' int(input()) < 30 int(input()) int input() input 30 if __name__ == '__main__':
    main() __name__ == '__main__' __name__ '__main__' main() main def main():
    print(['Yes', 'No'][int(input()) < 30]) def main():
    print(['Yes', 'No'][int(input()) < 30]) main
def main():
    print(['Yes', 'No'][int(input()) < 30])


if __name__ == '__main__':
    main()
